光伏电源对10kV配电网保护影响的研究

发布时间：2019-05-28 02:43

【摘要】：人类要想有效的解决化石能源濒临匮乏的问题,发展可再生能源是一条切实可行的重要途径。光伏发电是众多可再生能源发电中优势最明显的,也是最具发展潜力的。近年来我国光伏电源并网的渗透率也在日益增大,给配电网带来了挑战。系统特征、潮流分布情况、短路电流流向以及节点电压会因其接入而发生变化,原有保护配置没办法满足需求,不适用于现在的配电网环境。首先,阐述关于继电保护的相关概念、任务要求以及传统配电网中常采用的三段式电流保护的动作原理、整定原则及灵敏度校验方法,并且分析保护之间如何相互配合动作,可靠隔离故障。对ETAP软件中光伏电源模型、逆变器主要功能及相关参数进行分析。参考实际配电网结构与保护特征,利用ETAP软件建立了10kV系统模型,合理地设置模型中各元件参数,并通过运行潮流的方式验证本文模型设计是科学合理的。其次,在理论上对光伏不同的接入情况对保护带来的影响进行分析。通过ETAP软件建立的仿真模型,得到影响继电保护正常运行的三个因素分别为光伏的接入容量、接入点位置以及故障点与接入点的位置关系。仿真分析并总结出上述三个因素对短路电流以及保护动作影响的详细状况。最后,针对特定影响情况,计算出光伏电源的准入容量,在原有保护配置基础上,适当限制其接入容量。利用ETAP软件仿真验证上述策略行之有效。本文为光伏接入配电网对继电保护影响的研究提供了理论与现实依据。
[Abstract]:If human beings want to effectively solve the problem that fossil energy is on the verge of scarcity, the development of renewable energy is a feasible and important way. Photovoltaic power generation is the most obvious advantage and the most potential for development among many renewable energy power generation. In recent years, the permeability of photovoltaic power supply connected to the grid is increasing day by day, which brings challenges to the distribution network. The system characteristics, power flow distribution, short circuit current flow direction and node voltage will change due to their access, the original protection configuration can not meet the needs, and is not suitable for the current distribution network environment. First of all, this paper expounds the related concepts of relay protection, task requirements, the action principle, setting principle and sensitivity check method of three-stage current protection commonly used in traditional distribution network, and analyzes how to cooperate with each other between protection. Reliable isolation of faults. The photovoltaic power supply model, main functions and related parameters of ETAP software are analyzed. Referring to the actual distribution network structure and protection characteristics, the 10kV system model is established by using ETAP software, and the parameters of each component in the model are set up reasonably, and the scientific and reasonable design of the model is verified by running power flow. Secondly, the influence of photovoltaic access on protection is analyzed theoretically. Through the simulation model established by ETAP software, the three factors that affect the normal operation of relay protection are photovoltaic access capacity, access point location and the relationship between the location of the access point and the access point. The effects of the above three factors on short circuit current and protection action are analyzed and summarized by simulation. Finally, according to the specific influence situation, the admission capacity of photovoltaic power supply is calculated, and the access capacity of photovoltaic power supply is properly limited on the basis of the original protection configuration. ETAP software simulation is used to verify the effectiveness of the above strategy. This paper provides a theoretical and practical basis for the study of the influence of photovoltaic access distribution network on relay protection.
【学位授予单位】：沈阳农业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TM615;TM77

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